Study of Pyrene Adsorption on Two Brazilian Soils

Teixeira, Silvio Lopes; Ziolli, Roberta Lourênço; Marques, Mônica Regina da Costa; Pérez, Daniel Vidal

doi:10.1007/s11270-010-0707-3

Cited by 17 publications

(14 citation statements)

References 12 publications

(11 reference statements)

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“…This trend was attributed to the fact that when the transport of metals between the sorbent's external surface film and internal pores are equal, the trans-boundary movement of metals will not be significantly permissible; however, increasing concentration will re-initiate the trans-boundary movement and hence, the process will be concentration dependent. Similar findings have been reported in literature for similar and other pollutants adsorption [1,38,39]. The Figures also showed that increase in temperature did not lead to any significant increase in adsorption except for Cu(II) on the BEN clay.…”

Section: Equilibrium Experiments and Effect Of Temperaturesupporting

confidence: 90%

Calcined biomass-modified bentonite clay for removal of aqueous metal ions

Olu-Owolabi

Alabi

Unuabonah

et al. 2016

Journal of Environmental Chemical Engineering

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A B S T R A C TRecent studies have shown that kaolinite clay modified with biosorbents are promising low cost adsorbents for the removal of metals from aqueous solution because the resultant composites have higher adsorption capacities, and hence a better aqueous metal ions removal efficiencies. However, some clay properties suggest that not all such modifications enhance adsorption capacity. In this study, bentonite (BEN) clay was calcined after modification with Carica papaya seeds or pine cone to obtain C. papaya-modified bentonite (CPB) and pine cone-modified bentonite (PCB). The efficiencies of these adsorbents for the removal of Pb(II), Cu(II) and Cd(II) ions from aqueous solutions were studied as a function of pH, time, sorbate concentration and temperature. X-ray diffraction results showed that CPB and PCB had lattice structure as BEN, but reductions in the surface areas of CPB and PCB were observed. Adsorption results showed that pH did not significantly affect removal of aqueous metal ions between pH 3 and 7. The adsorption fitted pseudo-second order (r 2 ! 0.966) and intra-particle diffusion models and indicated mainly surface phenomena involving sharing of electrons between the adsorbent surfaces and the metal ion species. Unlike Cu(II) and Cd(II), Pb(II) adsorption reduced in CPB and PCB indicating that not all calcined biomass-clay composites have enhanced aqueous metal adsorption efficiency. However, undesired properties such as adsorbent bleeding were removed and mechanical strength enhanced while easier separation of the adsorbents from solution as compared to the raw bentonite was observed.

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Section: Equilibrium Experiments and Effect Of Temperaturesupporting

confidence: 90%

Calcined biomass-modified bentonite clay for removal of aqueous metal ions

Olu-Owolabi

Alabi

Unuabonah

et al. 2016

Journal of Environmental Chemical Engineering

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“…Their effect on biota can be amplified by bioaccumulation in the food chain because PAHs like most organic pollutants are very soluble in fat. Once in the environment, they are subjected to various physical and/or chemical processes that determine their environmental fate (Okoli et al, 2014;Teixeira et al, 2011;Ramirez et al, 2001). Information on the bioavailability of pollutants in the environment is important because bioavailable pollutants are linked to the negative health disorders experienced by biota.…”

Section: Introductionmentioning

confidence: 99%

“…Among the various processes that determine the environmental fate of PAHs, sorption is the relatively most studied (Teixeira et al, 2011;Ramirez et al, 2001) because data obtained can give valuable information on suitable remediation strategy for the polluted soil. Sorption experiments can be used to determine the quantity of PAHs retained by a soil and, hence, the leachable or bioavailable quantity (Sparks, 2003).…”

Section: Introductionmentioning

confidence: 99%

Sorption and desorption of fluorene on five tropical soils from different climes

2015

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The main processes controlling soil-polycyclic aromatic hydrocarbon interaction is sorption-desorption as influenced by the soil physicochemical conditions. Sorption-desorption phenomena can influence translocation, persistence and bioavailability. Hence, laboratory batch experiments were undertaken to investigate the sorption characteristics of fluorene on five tropical soils from varying tropical agro-ecological zones having different physicochemical properties. Fluorene concentrations used for the study ranged from 20 to 100 μg/L, and results showed that fluorene sorption equilibria were attained usually within 24 h. Increase in pH had a negative effect on fluorene sorption. Fluorene sorption was concentration dependent and exothermic. The sorbed fluorene molecules were distributed between surface adsorption sites and phases in soil. Sorption was controlled by weak hydrophobic forces, such as the π-π interactions and Van der Waal's forces. Desorption hysteresis were most pronounced in soils with high organic matter contents than lower ones. The sorption was characterized as multiple reaction phenomena composed of several linear and non-linear isotherms. The physicochemical conditions of the soil must be understood in order to predict the fate and bioavailability of fluorene in soil.

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“…As this soil's organic matter content is below 0.1%, pyrene sorption was attributed to fine soil materials (Karichoff 1984). As Gonen and Rytwo (2006) reported, clays are not normally characterized as adsorption sites for PAHs; however, with the expansion of the interlamellar space caused by the hydratation of the clays, more sorption sites appear to become available (Teixeira et al 2010). …”

Section: Resultsmentioning

confidence: 86%

“…When organic matter content is below 0.1%, sorption and desorption processes are attributed to fine soil materials, mainly clays (Karichoff 1984;Teixeira et al 2010). Granulometry is strongly connected with the cation exchange capacity (CEC), which affects the achievement of CMC eff (Jönsonn et al 1998;Mulligan et al 2001).…”

mentioning

confidence: 99%

Influence of Soil Granulometry on Pyrene Desorption in Groundwater Using Surfactants

Rodríguez‐Escales

Sayara

Vicent

et al. 2011

Water Air Soil Pollut

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The high hydrophobicity of polycyclic aromatic hydrocarbons (PAHs) is the main limiting factor for the remediation of soils and aquifers. Surfactants are amphiphilic substances which encourage the transfer of hydrophobic compounds from the solid to the liquid phase. While the interaction between organic matter and surfactants has been widely studied, there is a lack of knowledge concerning the relationship between surfactant efficiency and the granulometry of soil and/or geologic material. In this paper, three non-ionic surfactants (Tween 80, Gold Crew, and BS-400) were used to study the desorption of pyrene, chosen as a representative PAH, in soils with different grain size proportions (1%, 5%, 10%, and 20% of clay and silt) and no organic matter (<0.1%). The best quantity of surfactant to apply is closely related to the proportion of fine materials. Tween 80 gave better maximum desorption than Gold Crew and BS-400 (89%, 40%, and 36%, respectively). As an important proportion of aquifers show fine material above 1%, the effective critical micellar concentration obtained when applying surfactants to this type of geologic materials has to be higher than 150 mg L −1 for Tween 80, and higher than 65 mg L −1 , and 100 mg L −1 for Golf Crew and BS 400, respectively. Furthermore, results indicate that carrying out simple laboratory tests before the use of surfactants on a field scale is necessary to improve the efficiency and minimize the financial and environmental impact of its application.

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Study of Pyrene Adsorption on Two Brazilian Soils

Cited by 17 publications

References 12 publications

Calcined biomass-modified bentonite clay for removal of aqueous metal ions

Calcined biomass-modified bentonite clay for removal of aqueous metal ions

Sorption and desorption of fluorene on five tropical soils from different climes

Influence of Soil Granulometry on Pyrene Desorption in Groundwater Using Surfactants

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